[MacPorts] #15077: Document that installing other software in /usr/local can break ports

[MacPorts]

#15077: Document that installing other software in /usr/local can break ports
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  Reporter:  ryandesign at macports.org  |       Owner:  markd at macports.org     
      Type:  enhancement              |      Status:  new                    
  Priority:  Normal                   |   Milestone:  Website & Documentation
 Component:  guide                    |     Version:                         
Resolution:                           |    Keywords:                         
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Comment (by afb at macports.org):

 This goes for `/usr` too, but presumably the vendor is the only one that
 install stuff there.

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Ticket URL: <http://trac.macosforge.org/projects/macports/ticket/15077#comment:1>
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